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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb3d1599f4fd0db6d100fdc8e089e91e860a985a3cda34fb300ce36384d833b5' 
  AND token = 'HwlpD/5fUsnM/D9eqcp5KuKZ4Coc0MPvHkjNQ3Y+sBM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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