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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c73b4b30dc5c9e78e0347df7443faddcc6c845399f7b8f06ca8fb98d3956fd9e' 
  AND token = '818p9E4miQatV2vfhvWnkhQx0k5ONmSbuaubjTo8zy8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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