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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c96e3551c3fd85165fcf756c4d15328eec51df1ccd223a84e850a95d9b3bc86d' 
  AND token = '8HDtp5IU2+hIzUDDxBW+vKTC31Ac+rBxS1iQIZ/BbWE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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