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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd97de7d782728142596cf34f6a073bd5eb48fba5bceb03e3d1dbd53335e24067' 
  AND token = 'kyl805nmvfSVm/mBkARs+1ZRIN9L8dmHP9ffDS8/TiA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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