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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff52c3e4b458e27041c56c9d935a3f4ece1809dd3158804c8afd40db7a14aa29' 
  AND token = 'a8gytTy7aDjMaVPy5O1m2SDnrEOtkqO+ae6M9JtcPlE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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