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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd1ff620a290d2aa33bf6ac71cac37c0649e5d1fd3ee7a15ca1f2809ee3ee82d' 
  AND token = '4EMT+Ql47VdA6YG2J6Kx76haU/G/+WdS1GuvhkSvXY0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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