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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fca61269f6604d7e143f95622a2fc06986ddea48122eb1630601f6e2eb2e63ca' 
  AND token = '+/tg5tILpFjMO6ul7Zj7WQsMW/s0Ze6U0Kx6YdGuWoQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}