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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c159622f86d4c84a56a1931c9c3823a179594871760fec7e62acf1e2a8c513fd' 
  AND token = 'trfI9CejDF9+odHWkUsCZYSQv74y3zg7FxnEJGHabIs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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