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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '28688623d08693e357a5964e9a5b56dcb4333021acb40dc90a97fe604198d8d8' 
  AND token = '9lBsyr6SQkdz9o42K4U1+YqI3hqxz1HwphoBRS8Y3f4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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