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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '48dbf21a9086236d633060b04d38f27a4951ecfa32a3febc0e3424012e6e4e80' 
  AND token = 'eeLUbDxXQSZxPk+UTBlMgNyNlcFCVOeMyxBoBVlSGsE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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