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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd9a71405543c6f10645258b8c3ced976367586ee197827df33c59542e1da18d' 
  AND token = 'mcP1xqoLFMZSsZT3toiBBIrfIaHHIXb0H4+xtjRiarE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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