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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1316261405327ad13f4caecb593259524fe0b500768a318903995e054cdd61d1' 
  AND token = '9Lk2SnvxYwKIE8qKYOa0H2brqOkOzfRu//CnC0oPl78=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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