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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '209f4b2c770346b0c233a440810128fd0ccc6660702cf2190b42743662ca94b8' 
  AND token = 'RSGBNTMh0E/PH/a8TVOHQEQuiCiypTJ0Pr4/zv5q/Fo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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