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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc89c6052c58a42f19a64bc6b3fb9f5c0ffe697475f8df6cea5eafee9fcba44b' 
  AND token = '0pZ2Tud7bSoEly+Z95/tVauJ3V6rTHpkGN48OhRY/TI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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