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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '25807b779f7edb0406b277676fec9f393dfdabaff2252ab65af0cc9f3c2d093b' 
  AND token = 'nahTl7AsYKQ2pLnwmJ+IB9mIcL4gShw4LS9KuxEuseg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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