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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3794027e7fe637b6f28ddb7c9d3519a55b4fea79432eef324e07498a99ca41c' 
  AND token = '9PInA1eS0uVcRVp6pbc/vVGeVJI8kQw70s6tYLl3v5Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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