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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0214b6795e792211c033027e278d832df03369f9b829cd1f8fc2963a9bff29c8' 
  AND token = 'WjC0QHOmmFMYx/PwrQF27mAEjHrTi81ROeJYSZr8lCA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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