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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '796399c9bc08ec0f31aba99d32cb30576bfed3f0aab225e37088ce158b577889' 
  AND token = 'n2QUzf32B/RYmSJoGJPtANPpmhNUaZdLSsV0E/D+xrs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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