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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00fea0ca348a9f37e9659ff1f3f68169a611a4b10e20dcd8a2391b221abb0853' 
  AND token = 'SmAQLHsTqib9ldCB20WDTJr2ZuwTP5mhhkIccbaTtpU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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