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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ceaca673b73187de590122c11352923d58f99cf399769b8cde0c3b6ec8e0b15' 
  AND token = 'A830/zMrthrK97Fd7fejClviNAh5RN79wMWRAEECSRY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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