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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '113d5dbf8c7605eff19a9e3aa250372ae4f2978a5959296536349b8fc26659dd' 
  AND token = 'HLjwgjLf2+ebqgfw0pCok3kZqag3gJU8heImqO7XnOQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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