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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3648fddce2b1a7d403a4083b772edc5476aafd4a2631ea1d704890864d6a2fe9' 
  AND token = 'DTN+8qG5MOQtB6MiaiQWsjiCBjzja4XledovZt17O5U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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