SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c6329926aafffa193f4f35ee8be3145dbd9f3218eb08da8355df713db310c53' 
  AND token = 'KpKLyt9xUu4iq+BjW5Z/vuFfYMa+V3gP94mG4xz0Ix8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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