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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '774bbc60ff5953b438cc0b0832a704b1cf525c2ede3fea8ea5c3b9ddd66538d0' 
  AND token = 'T+UnLlQRpWCe+siRwgdq7plOBnuxfk1/l9IUWClX/4c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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