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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '600ef1e9fabbfe144121af69c2b892eec5dff4fa35e561a9463e460304e6e0a5' 
  AND token = 'x4bVg49GHLoNy6ZKroA24WFveXSj3Jik0gg41WX/A2E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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