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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '326baa8ac562e5f3fb60ec8eaef879feefaf21a7225e601e98372fc0a26f511e' 
  AND token = 'Xo7FiaDHCLfeJlKTAGnd7XvYyuZsZvBwZStK6PPLTz4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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