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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '063fde14582205b8684a9f0ab777bf5d1390c23892b97f9696cdcb160f738bfe' 
  AND token = 'eym1uBm8R1h5xkG7HBDMcb7Ex8gAsWXgh8pjprU4rmA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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