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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eebc3ca692f7ef3bdbdb47fc25d1dc855948a63a7a4a7beade91263cfbd14388' 
  AND token = 'aCL4ICJl1isRhxEg0VZor8BJB8P1JZ9XoPzVfydAz3s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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