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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd13ddb5c7f25f01719d13167e9a227fe4f8e7a329f454700f9b7533c23ac00e4' 
  AND token = 'NXDFtMqJuza2bGC0ZUg7OpSlM7VebK2nldnasDNM0Ws=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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