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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fae915d7d487ffd0de8b4f5f26f13a54ce1b0aff51d9ff1be4968e1661ed7354' 
  AND token = 'BPzFA1xknfz63N/sIsAVIjSOYJXk8l7Yb3S+TdvYtRg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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