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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ac07bb789cb1975ac2772fca9e7f6c24ffd1027201953944ab7fec33892445a' 
  AND token = 'NZ/ulg9Cir5mgd67Xi1Tq/MSYa1fDcVTFobDaK7U1CQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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