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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fcf3558958d328c5f05a0ef8caede77f9075e2094e858b3c2c9f5c2a4573f53f' 
  AND token = 'Xun2uAjXL3ieSwtPahkPet71QN1YCuTsiTw7ULKJFqQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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