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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '910e10402753f424f211896b847694aa03f1e1b741e0f1ac01dc08bf90a5c3fb' 
  AND token = 'U9Pr8gnHHECyCEMR9TCJD9ihfc0WwofhsCMlnEA0X8Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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