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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b35abb1a8dc37212373339cd40a74e9a2666766eea05497182a8bbaac3dc198' 
  AND token = 'ogQZgmWGQGcCyBKbF5yrEBO5/ORGgIVs1SJ693wTcy4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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