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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89b0bccaf8ed0ac1e2f84429e16b14d5312995a5b9c2be6735f8458fa97c4b6c' 
  AND token = 'gpiNn7P2+oaKlhhQe2bDWoN4kWB2DxVoawloYeUA2CI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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