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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f56b2a242120a24a0c833d1b5a3ad0b8990022004a82c1fe5e1132714ad8f42' 
  AND token = 'rDncKDnKhfVZrXCjuyt0RIJ2SeIKMtFg2DdPxH43vWA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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