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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71d725b7288f3bfeb1326e0159a570188618924345a0db5fc5ef9c3512910bd0' 
  AND token = 'sY0iWCNf2qsmYKVPo1kFzy8f3R8LIZjwZ9otaeppZDU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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