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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1febe7ce7d770754dd6de7be2f58ef9745c28b77f49baadcfc49d1ab273f0e1c' 
  AND token = 'v/n0qGsHd7VAKol9uQsfXXPT2t+gRGZzzMdUEXDdh2Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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