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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac29ca6030d3d667a5fc589f9f74fb3a1a314058ea1012e8c9b5e67c9c1a4414' 
  AND token = 'ggfwVs7T/sOhRq3N0LKkelutqxlC19l1uj7UQM6hsr4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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