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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4d93a3e0aee13051812911a0542b347809b01ba963546da4e44c529343c39822' 
  AND token = '9P5MC69zEDOTwg+g1+LjUCcNrzQfvHUqKlfcD5QeVmk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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