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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e6a9dcdb59090802f4c2169ed78cfbe203eb148c1593cbb5d8663428af85244a' 
  AND token = 'KkeJmDYrA6aLw4lCfDbuhs8g6Q1dYciIjB/pW5bnymo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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