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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d3ea43cadbe71a314aef400160c405aabf8162e65d7cb4f1c590a6b55eee2fd' 
  AND token = 'D5V9NmOZNl34gQWGD+Y4pftXzAkX65SngbghILnJiMI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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