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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7b1e5643f94e63e2d7bab9b0c839e2cb974e9f7f7a50c26b6a6ca1b1b797c34' 
  AND token = 'Hgjp2OmEKGjtriRmHtDyCPuo8Zbbhk1S2yg05ZNmUng=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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