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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b8f39475aa64b32c77b4063ccfcb5e6afcb03c3b31f36125b27002f406cd72d1' 
  AND token = 'w5SXTCxg2rWIPbEf5TRnhoScoxDlJ19TcuMuhu7qaf8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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