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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e561462a89359e2a121d1471f15d0aba44375ff28aa1db3581de0871abb9e29' 
  AND token = '2bgsBKmTYro/VKivf06p9L4uS3zAY4/5HVsg5SeQ6HA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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