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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0cae3c6a8b6d3889550843d6c76cd92e789531a4c726d11491651ea51874823' 
  AND token = 'WsUu5nkfe5zZ4jGLkVyhgBT5CgUmIOMIdtqZH8DSD9Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00072

JSON explain

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