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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a8a458fcb2b94635b422f851a6fac719f02f4d82717af17da75f16dd667ff46' 
  AND token = 'd/Gq9qH80AaaImsxvSO/4S4hg9d7Edpjsj4d7HKWZ0k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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