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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2067da547d9825d21d20424f0327954d29d15cde63907c4fcd4b4ccfb9ec4222' 
  AND token = 'LvY5JKD/T9BBOMT7ZZcBQqHXBottwzcdA7qFsELq4/k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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