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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '172eaffcdc2b1602f24c1331be81c75606d525004d6ba029ce4b7af50e4b118f' 
  AND token = 'iheEAhaeHkxLg8EQoJU0dLTUVoW3MugFYnd14b5Dmfw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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