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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d018caf11bb06231188d7314db147970cf24912e3bed783feda9e777363b3da' 
  AND token = '6KhsFtaa/4rHVnIJWOo2pVfQwHtvlFut8Z+clyFkjj8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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