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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '208fdd39d1643a6c839f4146958e7ce738315c7bae2f7325e09fe3211e40a663' 
  AND token = 'vrHvNAawxU+ptuBllG0gBQi7o8/tyoQSlVLC5+ea5dE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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