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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa71cf5e70ea686bcd7fb9c3d346bf2bcd83cf27dbc65fb873e919aeeb0936f7' 
  AND token = 'rGolHDCyr61BUqe9TOrzXMnab66TK4949U0so7U/wtA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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