SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5cc21ffa625657497799ed616b93aa39210966b273dd50ebec228c213f9eae3b' 
  AND token = 'EgQ2VQqMKtY9BMGfFDX+GgDGt7+ojuZfjuBeTr8WpAc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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