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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c5ad046c0d746b7ae955f0383036a69c672ae3fedda0b74d068e06713bf2e8eb' 
  AND token = 'CqhJvej2gfsE6Y5TqcY0oStUwiHmqH4WtuFp5M6VmSc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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