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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89d14335a4fad8887f21f00cf4a1bccb2d375b2b0f6858b6a693f299217cc50b' 
  AND token = 'yaLyHFMm9SXsz1Zt7xRJ8HemslH3UlwZOj3jSUrNVkQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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