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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f672932e24244d4bb2c9da23430c26a36632dbc60a7035cd4e3027f09debc526' 
  AND token = 'qjqd46k3JByEWaF1cNfIGu8CEkKQkMFsjTn62H6CiQ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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