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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7da9e2f29e124cf6df5b25b9c481395b56aa04f1e0a6442d03a95ee3686624d' 
  AND token = 'd/nmsKGNo3QPSCSY+Dgovyrlj5Ldfo9jYP7sapIkIqc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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