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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '52399252dd84dbee72323bb10a4710bf05444f07c7b602113f4465474a4a5353' 
  AND token = 'fEIIeaCQGntKcv7xYqzXcTXZg+O9PwsQC1I5XdAJip0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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