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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e9a9f298272226dc95ac697555fa7d24f291407e0f8baec63d7278cc1155711' 
  AND token = 'DZ06GRTpbKGt2FIowtl7AwUf5M/56Gs2gn2kcqG0510=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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