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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60711d44f20f1ed05408a4d03384bd4ba85444e2cd89625506296bbc6d6f3650' 
  AND token = 'sh8w6wuNjNIx7SXNuX/cRUDJBt0kzvI2zThNRO13/no=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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