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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e4baa2182f51ceb53b3049f1cb50842e1976abc8c9451c2ed594e93c94addd6' 
  AND token = 'szky0u3sUNKm1nucaIuT60i+OD2RDrLUvfGoU+VoGtE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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