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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc46d56333c2d09d44a2b018ddfe5ee537abce01ccc4de65dacf0103565e9010' 
  AND token = '4AbvD3ZlXPRPR4lsvIjljWc8ruBnsH0Y/PaN9X+jZbk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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